using a file that you can down load on the internet. you can actually down load it right here. i have one on my computer. it makes me wonder about the next time nbc comes and checks my computer. this is what happens when a person fits a lower receiver on a gun that is not regulated when they printed it with a 3d printer. this is the video they released of themselves firing bullets out of it. as you can see, the 3d gun failed and busted apart after it fired about six rounds, which makes it yes, a gun, but the technical term for what kind of gun it is is it is a crappy gun because it blew apart. but this kind of thing is not going to stay a crappy gun for long. not when you can get this far with stuff you can find around the house. for all the work that has gone into thinking about who is allowed to have a gun in america and where you can buy one and what kinds of guns people are allowed to have, that all kind of goes out the window. people can just down load their chosen weapon at home and have it made manifests at their desk, as a fully functioning real-life weapon. we are not far off